Nigerian immigrant Frank Enwonwu holds details of a court case that is pending as he poses at a shelter, Wednesday, Jan. 16, 2008 in the Boston area. His son Brian Enwonwu, 13, is in the background. More than two decades ago, Enwonwu got caught smuggling five ounces of heroin into the United States from his homeland in Nigeria. He admitted his mistake and readily agreed to work as an informant, believing the U.S. had promised to keep him safe. A change in immigration law in 1996 retroactively made him liable to be deported for his drug conviction, despite his work to help the government. (AP Photo/Lisa Poole)

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